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telegraph
Developed by Samuel Morse, the telegraph revolutionized long-distance communication. It worked by transmitting electrical signals over a wire laid between stations -
computer
The first computer was invented by Charles Babbage in 1833. -
telephone
Telephone, an instrument designed for the simultaneous transmission and reception of the human voice. -
radio
Nikola Tesla invented the radio even though Guglielmo Marconi presented it in 1904. -
television
Philo Farnsworth successfully demonstrated electronic television in San Francisco, in 1927. Farnsworth, at the age of fifteen, began imagining ways that electronic television could work. One day while working in the fields among rows of vegetables, he was inspired. -
mobile phone
Martin Cooper, byname Marty Cooper, (born December 26, 1928, Chicago, Illinois, U.S.), American engineer who led the team that in 1972–73 built the first mobile cell phone and made the first cell phone call. He is widely regarded as the father of the cellular phone. -
tablet
The first true tablet computers were Cambridge Research's Z88 and Linus Technologies' Write-Top, which were introduced in 1987.